The Colorado Department of Revenue has issued a safety and health advisory after potentially unsafe pesticide residues were found on certain medical marijuana plant material and products.

The revenue department, in conjunction with the Colorado Department of Agriculture and the Colorado Department of Public Health and Environment, released the warning Wednesday after traces of two unapproved pesticides were found in Crossroads Wellness LLC dba Boulder Botanics products, according to a department news release.

Sample tests by the agriculture department identified the pesticides as bifenthrin and diuron, both of which are not on an approved list for use in marijuana cultivation. Consumers who possess marijuana flower, trim, concentrates or infused products cultivated by Crossroads Wellness are being urged to return them to the medical center where they were purchased to ensure proper disposal.